RADAR CHART POWER (RC-POWER) ® is an index of radar charts that indicates whether the radar chart has well-balanced high scores. Considering the power by the size and distortion of the polygon of the radar chart, the radar chart with well-balanced high scores has strong power.
The number of items in a radar chart for which RC-POWER is determined is unlimited, but RC-POWER can be obtained here for a 5-item radar chart.
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Use the following sample data for RC-POWER testing.
For more information on RC-POWER, refer to RADAR CHART POWER.
An Example of 5-Item Radar Charts
Table 1 shows sample data for the five items A, B, C, D, and E for the four sets I, II, III, and IV. The RC-POWER obtained for each set is also shown. Figure 1 shows these radar charts.
Table 1 Sample data for the four sets
| Perfect score 5.00 | I | II | III | IV |
|---|---|---|---|---|
| A | 3.00 | 3.03 | 3.34 | 3.00 |
| B | 3.00 | 2.02 | 1.08 | 2.00 |
| C | 3.00 | 4.05 | 3.58 | 1.00 |
| D | 3.00 | 3.04 | 4.99 | 5.00 |
| E | 3.00 | 3.03 | 2.36 | 4.00 |
| V | 45.0 | 45.0 | 45.0 | 45.0 |
| RC-POWER(%) | 60.0 | 56.4 | 37.6 | 29.6 |
RC-POWER is calculated as a percentage of power where all data is the perfect score.
These four radar charts create pentagons of equal area.
Click to enlarge
Figure 1 The radar charts with an equal area
Check that the areas are equal
The area of the pentagon created by the five-item radar chart is obtained by the following equation, where the values of items A, B, C, D, and E are a, b, c, d, and e, respectively.
where
Therefore, if the values of V are equal, the areas are equal. Please see Table 1, which also shows V.
Summary
- Although the size, or area, is the same, the RC-POWER decreases as the shape becomes distorted.
- In I and IV, the total score is 15, and the average is the same, but in IV, the data dispersion is larger than in I.
- Therefore, the RC-POWER of IV is smaller than that of I.
- In this way, RC-POWER is the value that combines average and variance.
- For more information, refer to One in RC-POWER.